You should elaborate what you want? Do you want a popup or an arrow like one shown in the screenshot?
Try this: http://jsfiddle.net/F47uy/
CSS:
#arrow{
border-left: 15px dashed transparent;
border-right: 15px dashed transparent;
border-bottom: 15px dashed grey;
margin-left:200px;
width:0;
height:0;
}
#box{
background:grey;
width:300px;
height:300px;
}
solved Make a div like google [closed]